Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d7ab116c70d5d5…

MALICIOUS

PDF

70.8 KB Created: 2021-02-23 06:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b884bb1d8484164e14675aa873cf1533 SHA-1: 1180395db86f7423698ec92fddd16797a0469608 SHA-256: 79d7ab116c70d5d54097c6b12918a69db03fb58d202702277d201a5c13fe25ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/123?utm_term=air+o+swiss+humidifier+7135 PDF link annotation
    • http://latujor.22web.org/jonexi.pdfIn PDF document text
    • http://mangalvpodarok.ru/77250924346dh93g.pdfIn PDF document text
    • http://kefoweloruzopos.22web.org/xupasifumiz.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/peaky_blinders_series_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410018/normal_5ff5f4eccb5d9.pdfIn PDF document text
    • http://fruitslope.online/mathilda_mary_shelley_resumenw4iw4.pdfIn PDF document text
    • https://nasebawesor.weebly.com/uploads/1/3/1/6/131637432/wisejobipan-rabobe-kewiruzavef.pdfIn PDF document text
    • http://pop-marketplace.ru/air_pollution_book_by_m.n.rao_free_downloadbgf5p.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/461b292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jupuluna.epizy.com/ganesh_aarti_song_free.pdfIn PDF document text
    • http://rasunafosav.epizy.com/69462973189.pdfIn PDF document text
    • http://matogojetize.rf.gd/86249858649.pdfIn PDF document text
    • http://muravurut.epizy.com/23786318774.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/audio_song_of_krishna_bhajan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 5104 bytes
SHA-256: 2339b191b931f87471977afbb084eea4e96925f6def6041a457c56e95598fdee
font_01_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 10648 bytes
SHA-256: c1fa1e93bfc446952f45985263329e08ddecf9776fb293279af75882d14c85e7
font_02_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361